LCOV - code coverage report
Current view: top level - include/linux - mm_inline.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 11 11 100.0 %
Date: 2014-02-18 Functions: 0 0 -
Branches: 26 30 86.7 %

           Branch data     Line data    Source code
       1                 :            : #ifndef LINUX_MM_INLINE_H
       2                 :            : #define LINUX_MM_INLINE_H
       3                 :            : 
       4                 :            : #include <linux/huge_mm.h>
       5                 :            : #include <linux/swap.h>
       6                 :            : 
       7                 :            : /**
       8                 :            :  * page_is_file_cache - should the page be on a file LRU or anon LRU?
       9                 :            :  * @page: the page to test
      10                 :            :  *
      11                 :            :  * Returns 1 if @page is page cache page backed by a regular filesystem,
      12                 :            :  * or 0 if @page is anonymous, tmpfs or otherwise ram or swap backed.
      13                 :            :  * Used by functions that manipulate the LRU lists, to sort a page
      14                 :            :  * onto the right LRU list.
      15                 :            :  *
      16                 :            :  * We would like to get this info without a page flag, but the state
      17                 :            :  * needs to survive until the page is last deleted from the LRU, which
      18                 :            :  * could be as far down as __page_cache_release.
      19                 :            :  */
      20                 :            : static inline int page_is_file_cache(struct page *page)
      21                 :            : {
      22                 :   29924990 :         return !PageSwapBacked(page);
      23                 :            : }
      24                 :            : 
      25                 :            : static __always_inline void add_page_to_lru_list(struct page *page,
      26                 :            :                                 struct lruvec *lruvec, enum lru_list lru)
      27                 :            : {
      28                 :            :         int nr_pages = hpage_nr_pages(page);
      29                 :            :         mem_cgroup_update_lru_size(lruvec, lru, nr_pages);
      30                 :   29945117 :         list_add(&page->lru, &lruvec->lists[lru]);
      31                 :   29953359 :         __mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, nr_pages);
      32                 :            : }
      33                 :            : 
      34                 :            : static __always_inline void del_page_from_lru_list(struct page *page,
      35                 :            :                                 struct lruvec *lruvec, enum lru_list lru)
      36                 :            : {
      37                 :            :         int nr_pages = hpage_nr_pages(page);
      38                 :            :         mem_cgroup_update_lru_size(lruvec, lru, -nr_pages);
      39                 :            :         list_del(&page->lru);
      40                 :   29855059 :         __mod_zone_page_state(lruvec_zone(lruvec), NR_LRU_BASE + lru, -nr_pages);
      41                 :            : }
      42                 :            : 
      43                 :            : /**
      44                 :            :  * page_lru_base_type - which LRU list type should a page be on?
      45                 :            :  * @page: the page to test
      46                 :            :  *
      47                 :            :  * Used for LRU list index arithmetic.
      48                 :            :  *
      49                 :            :  * Returns the base LRU type - file or anon - @page should be on.
      50                 :            :  */
      51                 :            : static inline enum lru_list page_lru_base_type(struct page *page)
      52                 :            : {
      53 [ +  + ][ +  + ]:   58868320 :         if (page_is_file_cache(page))
         [ +  + ][ +  + ]
         [ -  + ][ +  + ]
      54                 :            :                 return LRU_INACTIVE_FILE;
      55                 :            :         return LRU_INACTIVE_ANON;
      56                 :            : }
      57                 :            : 
      58                 :            : /**
      59                 :            :  * page_off_lru - which LRU list was page on? clearing its lru flags.
      60                 :            :  * @page: the page to test
      61                 :            :  *
      62                 :            :  * Returns the LRU list a page was on, as an index into the array of LRU
      63                 :            :  * lists; and clears its Unevictable or Active flags, ready for freeing.
      64                 :            :  */
      65                 :            : static __always_inline enum lru_list page_off_lru(struct page *page)
      66                 :            : {
      67                 :            :         enum lru_list lru;
      68                 :            : 
      69   [ -  +  -  + ]:   28920783 :         if (PageUnevictable(page)) {
      70                 :            :                 __ClearPageUnevictable(page);
      71                 :            :                 lru = LRU_UNEVICTABLE;
      72                 :            :         } else {
      73                 :            :                 lru = page_lru_base_type(page);
      74 [ +  + ][ +  + ]:   28920783 :                 if (PageActive(page)) {
      75                 :            :                         __ClearPageActive(page);
      76                 :   28489987 :                         lru += LRU_ACTIVE;
      77                 :            :                 }
      78                 :            :         }
      79                 :            :         return lru;
      80                 :            : }
      81                 :            : 
      82                 :            : /**
      83                 :            :  * page_lru - which LRU list should a page be on?
      84                 :            :  * @page: the page to test
      85                 :            :  *
      86                 :            :  * Returns the LRU list a page should be on, as an index
      87                 :            :  * into the array of LRU lists.
      88                 :            :  */
      89                 :            : static __always_inline enum lru_list page_lru(struct page *page)
      90                 :            : {
      91                 :            :         enum lru_list lru;
      92                 :            : 
      93         [ +  - ]:   29036671 :         if (PageUnevictable(page))
           [ +  +  +  + ]
      94                 :            :                 lru = LRU_UNEVICTABLE;
      95                 :            :         else {
      96                 :            :                 lru = page_lru_base_type(page);
      97 [ +  + ][ +  + ]:   29026612 :                 if (PageActive(page))
      98                 :   27620977 :                         lru += LRU_ACTIVE;
      99                 :            :         }
     100                 :            :         return lru;
     101                 :            : }
     102                 :            : 
     103                 :            : #endif

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